OS X 10.9.5 how can i upgrade this to new version
OS X 10.9.5 how can i upgrade this to new version
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Check this page: https://everymac.com/systems/apple/imac/index-imac.html
Your iMac should be at the bottom of the page.
Open the link for your iMac and look for Max OS (middle bottom of the web-page.
Assuming you have the correct hardware, check this page: https://support.apple.com/en-us/HT201475
